Traefik + CloudFlare

Bug fixes:

• [k8s/gatewayapi] Reject cross-provider references with backendRefs.namespace (#13322 @youkoulayley)
• [server] Bump to github.com/pires/go-proxyproto v0.12.0 (#13313 @timschumi)
• [tls] Fix routers with same host, different tlsoptions on different entryPoint (#13329 @juliens)
• [tls] Fix snicheck for routers with no hosts (#13333 @rtribotte)